\Ob*serve"\, v. t. [imp. & p. p. {Observed}; p. pr. &
vb. n. {Observing}.] [L. observare, observatum; ob (see
{Ob-}) + servare to save, preserve, keep, heed, observe:
cf.F. observer. See {Serve}.]
1. To take notice of by appropriate conduct; to conform one's
action or practice to; to keep; to heed; to obey; to
comply with; as, to observe rules or commands; to observe
civility.
Ye shall observe the feast of unleavened bread.
--Ex. xii. 17.
He wolde no such cursedness observe. --Chaucer.
Must I budge? Must I observe you? --Shak.
With solemn purpose to observe Immutably his
sovereign will. --Milton.
2. To be on the watch respecting; to pay attention to; to
notice with care; to see; to perceive; to discover; as, to
observe an eclipse; to observe the color or fashion of a
dress; to observe the movements of an army.
3. To express as what has been noticed; to utter as a remark;
to say in a casual or incidental way; to remark.

\Ob*serve"\, v. i.
1. To take notice; to give attention to what one sees or
hears; to attend.
2. To make a remark; to comment; -- generally with on or
upon.
I have barely quoted . . . without observing upon it.
--Pope.
Syn: To remark. See {Remark}.